Mossberg 590 Shockwave Special Purpose, 12 Gauge, 14 Cylinder Barrel, 3 Chamber, Blue, Bead Sight, 26.5 Overall Length, 5RD 50659 With credentials hard-earned over decades of military and law enforcement use, the 590 Firearm is the perfect choice for your personal and home defense needs. Dual extractors, positive steel-to-steel lockup, twin action bars, and an anti-jam elevator ensure smooth operation.